Longest day in the Northern hemisphere is ________.
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Science dealing with study of soil is called
What is main root of plants called as?
'Neo-Malthusian Theory' is associated with which of the following?
_____ is the source of energy and materials in human beings.
Marble is a metamorphic rock of _______.
In terms of size, Mars ranks no. ___ in our Solar System.
Sandstone is which type of rock?